A car travels counterclockwise around a flat circle of radius 0.25 km at a constant speed of 20 m/s. When the car is at point A as shown in the figure, what is the car's acceleration?
A. 1.6 m/s2, south
B. Zero
C. 1.6 m/s2, east
D. 1.6 m/s2, north
E. 1.6 m/s2, west
Answer: E
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When an electron in H changes its spin from the same to the opposite direction as the proton, it:
A) emits an X-ray photon. B) absorbs a radio wave photon. C) emits a radio wave photon. D) absorbs a visible light photon. E) neither emits nor absorbs a photon.
A proton moves around a circular path (radius = 2.0 mm) in a uniform 0.25-T magnetic field. What total distance does this proton travel during a 1.0-s time interval? (m = 1.67 × 10?27 kg, q = 1.6 × 10?19 C)
A. 82 km B. 59 km C. 71 km D. 48 km E. 7.5 km
Lead that comes from radioactive decay is called ______________ lead
Fill in the blank(s) with correct word
A hoop with a mass of 2.75 kg is rolling without slipping along a horizontal surface with a speed of 4.50 m/s when it starts down a ramp that makes an angle of 25.0° with the horizontal
What is the rotational kinetic energy of the hoop after it has rolled 3.00 m down the ramp? A) 34.2 J B) 22.4 J C) 44.9 J D) 62.0 J E) This question cannot be answered without knowing the radius of the hoop.